Abstract
Anthessius isamusi n. sp. is described based on female and male specimens from a turbinid gastropod, Turbo marmoratusLinnaeus, collected in the East China Sea off Kumejima Island, the Ryukyu Islands, southern Japan, during the KUME-JIMA 2009 Expedition. The female of the new species is differentiated from its congeners by the following combinationof characters: 1) the absence of denticles on the ventral surface of the anal somite; 2) the length to width ratio of the caudalramus; 3) the antenna bearing 4 claws; 4) the maxilla with 3 distal teeth; 5) the exopod of leg 4 with 3 spines on the terminal segment, and; 6) leg 5 with a rod-like terminal segment.
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